[Null]

Well most izi way:

Wait for the next release, it will have custom tabs adding feature.

Hard way:

Using phpmyadmin you can add into the menu table:

DEFAULT, 'Excample tab', 'inactive', 'pagename.php', 'front-page', 0

Well ‘front-page’ is more complicated to add it should be changed to something else and added as a plugin (i know this sounds weird), so let it in and see what happens….

About the pm issue, i am not familair with it what does it do? Can you show me? If it is a page that is added then this is possible INCLUDING that the tab stays active…

problem that could happen is for non logged in visitors, they will see the tab too